What color is #283F45?

#283F45 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(40, 63, 69), and in HSL hsl(192, 27%, 21%).

Is #283F45 accessible as text?

On white, #283F45 has a contrast ratio of 11.13:1 (passes WCAG AA for body text); on black it is 1.89:1 (fails). For text placed on #283F45, use white for the best readability.

What is the closest Tailwind color to #283F45?

The nearest Tailwind CSS token is gray-700 (#364153).

What colors go well with #283F45?

As a neutral, #283F45 pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #283F45 the same as CSS darkslategray?

No — #283F45 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#283F45 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #283F45

Not just a swatch — here's how #283F45 works with other colors. Named schemes with #283F45 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #283F45 Accent #A6C4BE Surface #DFDABF Secondary #9AA0A0 Anchor #1E3549

Onyx opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #283F45 Secondary #AEB4B8 Surface #F1F2F0 Support #7B94A5 Anchor #2E3236

Onyx keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #283F45 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #4A5F65

Onyx is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Onyx.

Vintage Leather Lead · 5 colors

Lead #283F45 Secondary #705116 Surface #E3DCC0 Accent #395243 Anchor #56233E

Onyx plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #283F45 Secondary #5A6265 Support #969386 Ink #16140F

Onyx is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Onyx carrying the quiet middle.

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Color Lab

How #283F45 actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 41/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

Mid depth — usable as an accent or a muted ground.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 64/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 12/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 35/100

Low

Workable accent with care around contrast.

Surface fit 53/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 92/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #283F45

For UI

For branding

For interior

For fashion

People also use #283F45 with

Feldgrau Gunmetal Gray Bistre Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 11.1:1. Use

Subtle surface Use #CFDBDF for cards and hover fills. Tint 80

Avoid beside #273544 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #283F45 at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #283F45;
  --color-base-rgb: 40 63 69;
  --color-base-oklch: oklch(35.1% 0.030 215.9);
  --color-50: #F5F9FA;
  --color-100: #E5EEF0;
  --color-200: #CBDDE1;
  --color-300: #A6C2C9;
  --color-400: #83A6AF;
  --color-500: #638992;
  --color-600: #506B72;
  --color-700: #3D4E52;
  --color-800: #2A3437;
  --color-900: #1B2122;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F5F9FA',
    100: '#E5EEF0',
    200: '#CBDDE1',
    300: '#A6C2C9',
    400: '#83A6AF',
    500: '#638992',
    600: '#506B72',
    700: '#3D4E52',
    800: '#2A3437',
    900: '#1B2122',
  },
}

$base: #283F45;
$base-ink: #FFFFFF;
$base-50: #F5F9FA;
$base-100: #E5EEF0;
$base-200: #CBDDE1;
$base-300: #A6C2C9;
$base-400: #83A6AF;
$base-500: #638992;
$base-600: #506B72;
$base-700: #3D4E52;
$base-800: #2A3437;
$base-900: #1B2122;
$base-hover: #1F3236;
$base-subtle: #B6CACF;

{
    "color": {
        "base": {
            "value": "#283F45",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F9FA",
                "type": "color"
            },
            "100": {
                "value": "#E5EEF0",
                "type": "color"
            },
            "200": {
                "value": "#CBDDE1",
                "type": "color"
            },
            "300": {
                "value": "#A6C2C9",
                "type": "color"
            },
            "400": {
                "value": "#83A6AF",
                "type": "color"
            },
            "500": {
                "value": "#638992",
                "type": "color"
            },
            "600": {
                "value": "#506B72",
                "type": "color"
            },
            "700": {
                "value": "#3D4E52",
                "type": "color"
            },
            "800": {
                "value": "#2A3437",
                "type": "color"
            },
            "900": {
                "value": "#1B2122",
                "type": "color"
            }
        }
    }
}